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Finding the Fourth Proportional to 520,128.40, 778,880.40 and 415,152.40

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Solution

The fourth proportional to 520,128.40, 778,880.40 and 415,152.40 is: 621,681.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,128.40 : 778,880.40 = 415,152.40 : x
  2. Step 2: Convert to fraction form
    520,128.40/778,880.40 = 415,152.40/x
  3. Step 3: Cross multiply
    520,128.40x = 778,880.40 × 415,152.40
  4. Step 4: Simplify right side
    520,128.40x = 323,354,067,372.96
  5. Step 5: Solve for x
    x = 323,354,067,372.96/520,128.40
  6. Step 6: Final answer
    x = 621,681.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.